Refrigerant Charging Calculation - Mitsubishi Electric PQHY-P200YHM-A Data Book

(16)-6 Refrigerant charging calculation

Sample connection (with 3 BC controller and 6 indoor units)
HU
HU
(Main unit)
(Sub unit)
H
F
G
Reducer (P15-P50)
(attached with BC controller)
Amount of additional refrigerant to be charged
Refrigerant for extended pipes (field piping) is not factory-charged to the outdoor unit. Add an appropriate amount of refriger
Record the size of each high pressure pipe and liquid pipe, and the amout of refrigerant that was charged on the outdoor unit for future reference.
Calculating the amount of additional refrigerant to be charged
The amount of refrigerant to be charged is calculated with the size of the on-site-installed hige pressure pipes and liquid pipes, and their length.
Calculate the amount of refrigerant to be charged according to the formula below.
Round up the calculation result to the nearest 0.1kg. (i.e., 16.08 kg = 16.1 kg)
<Amount of additional refrigerant to be charged>
Calculating the amount of additional refrigerant to be charged
High pressure
Additional refrigerant pipe size
charge Total length of ø 28.58
=
x 0.36
(kg) (m) x 0.36(kg/m)
Liquid pipe size
Total length of ø 15.88
+
x 0.2
(m) x 0.20(kg/m)
BC controller
(Standard / Main)
+
3.0 kg
Amount of factory charged refrigerant
Outdoor unit
Charged amount
Model
P200
P250
5.0 kg
P300
Limitation of the amount of refrigerant to be charged
The above calculation result of the amount of refrigerant to be charged must become below the value in the table below.
Heat source unit model
Maximum amount of refrigerant *1 kg
*1 Amount of additional refrigerant to be charged on site.
Heat source unit Twinning kit (High/Low press.)
CMY-Q100VBK:
The Low press. kit is set in the Main unit ;
The High press. kit is to be installed in the field.
A
BC controller (Main BC)
CMY-Y102S-G
(Joint)
a
CMY-R160-J1 b
(Joint)
IU IU
2 : P250
1 : P50
High pressure
pipe size
Total length of ø 22.20
+ +
x 0.23
(m) x 0.23(kg/m)
Liquid pipe size
Total length of ø 12.7
+ +
x 0.12
(m) x 0.12(kg/m)
BC controller
Charged amount
(Sub) Total units
+
1 unit 1.0 kg
2 units 2.0 kg
Sample calculation
A : ø28.58 40m
B : ø9.52 10m
C : ø12.70 10m
D :
ø9.52 5m
E :
ø9.52 5m
F : ø22.20 2m
G : ø22.20 1m
Total length for each pipe size :
Therefore, additional refrigerant charge
P200 P250 P300 P400
34.3 43.3 44.3 58.5
CMY-Y202-G2
CMY-Y102L-G2
CMY-Y102S-G2
D
(Joint)
C
E
B
c d
IU IU
3 : P15 4 : P20
High pressure High pressure
pipe size pipe size
Total length of ø 19.05 Total length of ø 15.88
+
x 0.16 x 0.11
(m) x 0.16(kg/m) (m) x 0.11(kg/m)
Liquid pipe size Liquid pipe size
Total length of ø 9.52 Total length of ø 6.35
+
x 0.06 x 0.024
(m) x 0.06(kg/m) (m) x 0.024(kg/m)
Total capacity
of connected Charged amount
+ indoor units
-80 2.0 kg
81 - 160 2.5 kg
161 - 330 3.0 kg
331 - 390 3.5 kg
391 - 480 4.5 kg
481 - 630 5.0 kg
631 - 710 6.0 kg
711 - 800 8.0 kg
801 - 890 9.0 kg
891 - 10.0 kg
Indoor
1 : P50 a : ø6.35 5m
2 : P250 b : ø9.52 3m
3 : P15 c : ø6.35 2m
4 : P20 d : ø6.35 3m
5 : P140 e : ø9.52 3m
6 : P200 f : ø9.52 10m
ø28.58 A = 40m
ø22.20 F+G = 2+1 = 3m
ø12.70 C = 10m
ø9.52 B+D+E+b+e+f = 36m
ø6.35 a+c+d =10m
= 40x0.36 + 3x0.23 + 10x0.12 + 36x0.06 + 10x0.024 + 3.0 + 2.0 + 6.0
= 29.69kg
= 29.7kg
P450 P500 P550
65.5 79.2 67.2
- 109 -
IU
e
5 : P140
BC controller (Sub BC)
BC controller (Sub BC)
f
IU
6 : P200
ant for each pipes on site.
P600
70.9